I'm not following the "uncrop" portion of jpguncrop. Sure, the images are different, but unlike aCropalypse it's not clear how the image is supposed to be reconstructed from the data without already having knowledge what the data was. All this says is "yep, there was something other than a black square there before" and it's fair to say you could figure that out by the presence of the black square in the first place.

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